Gearing



June 17, 1930. CALDWELL 7 1,763,645

GEARING Original Filed Oct. 17, 1921 HARRY J. CALDWELL, OF ROCKFORD,ILLINOIS, ASSIGNOR TO THE INGERSOLL MILL- Patented June 17, 1930 UNITEDSTATES PATENT OFFICE ING IMAGHINE COMPANY, 01 ROCKFORD, ILLINOIS, ACORPORATION OF ILLINOIS GEARING Original application filed October 17,1921, Serial N'o. 508,374. Divided and this application filed December31, 1925. Serial No. 78,515.

This invention relatesv to gearing generally and more particularlychange speed and reverse gearing adapted for feeding and traversing thetable in a reciprocating type milling machine.

The principal object of the invention is to provide a simple, compact,and economical gearing mechanism for the purpose mentioned enabling thetransmission of power forward and reverse to a driven shaft at arelatively low speed for feed purposes and at a relative- 1y high speedfor traverse purposes, the change from one speed to another or from onedirection to another being controlled by the operation of'two clutcheswhich when shifted simultaneously effect a change in speed in the samedirection and which when shifted separately effect a change indirectionor a change in both speed and direction.

The present application is a division of my application Serial No.508,374 filed October. 17, 1921, which eventuated 1n Patent 1,599,204,September 4, 1926.

The invention is more fully described in the following specification inwhich reference s made to the accompanying drawing, where- 111- Figure 1is a horizontal section through a casing containing my improved gear1ng;and

Fig. 2 is a cross-section taken substant ally on the line 22 of Fig. 1looking in the direction of the arrows.

The invention is illustrated as arrangedfor application toareciprocating type milling machine, that is, one in which the work iscarried on a table moving back and forth past the cutting tool or tools.The gearing is arranged for feeding the work table or the equivalentthereof back and forth at relatively fast and slow speeds during eachstroke and preferably in a continuouscycle including rapid traverse andfeed movements in both directions. It should, however, be understod thatthe present improvements are capable of a wide variety of applicationswherever power transmission in the manner herein contemplated may findapplication, on machine tools or otherwise. D

The gearing isillustrated as housed within a casing 5 adapted formountlng on the and at different positions thereon. A drivmg shaft 7 anda driven shaft 8 journaled in the gear box 5 are connected byintermediate gearing for the transmission of power from the shaft 7 tothe shaft 8 at two speeds forward and reverse, as will presently appear.

Any suitable means such, for example, as a belt driven pulley arrangedfor connection with the shaft 7 through the agency of a clutch to beshifted at the will of the operator may be provided for driving theshaft 7. The

driven shaft 8 on the other hand may be con- I nected directly orthrough the agency of suitable change speed or reduction gearing withthe feed screw of the reciprocating tablepreviously referred to. drivingshaft 7 revolves continuously in one direction and through the agency ofthe gearing and clutches between it and the shaft 8 the latter will bedriven in opposite directions and at difierent speeds forcorrespondingly propelling the work table.

The shaft 7 carries a pair of opposed bevel gears 9 and 10 looselythereon, having an intermediateclutch element 11 splined on the shaftand adapted to be shifted in either direction for connecting its clutchteeth 12 with I the complemental teeth on either of the bevel gears 9 or10. An intermediate bevel gear 13 meshes with both of the gears 9 and 10and is fixed to a transverse worm shaft 14 journaled in a bearing 15within the gear box 5. The worm shaft has a worm screw 16 fixed thereonadjacent an end bearing 17 provided in a bracket 18 extending from thegear box. A bevel gear 19 is also fixed on the shaft 14 and meshes witha bevel gear 20 fixed to an intermediate shaft 21 mounted in a bearing22 within the gear box 5. The shaft 21 has a sleeve 23 turning therewithprovided with a flange 24 to engage one side of a spur In operation, theI gear 25 with a friction element 26 interposed. A flange 27 on anothersleeve 28 engages the opposite side of the spur gear 25 with anotherfriction element 26 interposed. The arrangement provides a frictionaldrive connection between the shaft 21 and the spur gear 25 wherebysudden shocks or strains incidental to sudden reversing or changes inspeed are absorbed and not communicated to the gearing. The spur gear 25meshes with a spur gear 30 loose on the driven shaft 8. A worm gear 31also loose on the driven shaft meshes with the worm screw 16 fixed onthe shaft 14. A clutch element 32 splined on the driven shaft 8 isadapted to be shifted in opposite directions to engage the clutch teethat its ends with complemental teeth on the gears 30 and 31.

A rock shaft 33 carries a lever 34 within the gear box, one end 35 ofwhich is forked and in operative connection with the clutch element 32for shifting the latter, and the opposite end of which carries a springpressed plunger 36 having a pointed head the faces of which are adaptedto cooperate with a stationary roller 37 for holding the clutch 32yieldingly in either of the positions to which the same may be shifted.Another rock shaft 38 has a forked arm 39 operatively engaging theclutch element 11 for shift ing the latter and likewise has a springpressed plunger 40 the faces of which are adapted to engage anotherstationary roller 41 for the purpose of holding the clutch 11 yieldinglyin either engaged position. Since the means for operating the clutchshifting levers forms no part of the present invention but is fullydescribed in my application above mentioned, it will suflice to statethat the movements thereof may be produced by the dogs mounted on thetable of the machine to actuate the proper clutches at the properpredetermined times.

From the foregoing description, it will be evident that when the drivingshaft 7 is rotated in a clockwise direction viewing the right hand sideof Fig. 1 with the clutches engaged in the manner shown, the shaft 8will be driven in the same direction through the agency of gears 9, 13,19, 20, 25, and 30 at a speed corresponding to the rapid traversemovement of the work table. The worm gear 31 will, however, be revolvedin the opposite direction through the agency of the worm screw 16 and,of course, at a reduced speed. If the clutch element 11 is shifted toconnect the gear 10 to the driving shaft without shifting the clutch 32,the rapid traverse drive will obviously be reversed. The shifting of theclutch 32 to the opposite position connects the worm gear 31 with theshaft 8 and the latter is driven at a slow feed speed in acounterclockwise direction because of the fact that the worm wheel 31,as previously stated, turns in the opposite direction from the gear 30.If, however, both of the clutches 11 and 32 are simultaneously shiftedto the right from the positions shownthe worm wheel 31 will be turnedclockwise, and the shaft 8 will be driven in the same direction as itwas previously driven by the gear 30 but, of course, at a reduced speed.The clutch shifting means, as described in my application abovementioned, provides for the simultaneous or separate shifting of theclutches to produce the operations referred to.

It is believed that the foregoing description conveys a clearunderstanding of the invention and of its purposes and advantages sothat anyone skilled in the art to which the invention relates willappreciate the possible applications thereof.

I claim:

1'. A gearing mechanism of the character described adapted for use witha reciprocating type machine tool, comprising a driven shaft, a drivingworm shaft, an intermediate shaft having a bevel gear fixed thereon, asecond bevel gear meshing therewith and fixed to the worm shaft-,a spurgear fixed on said intermediate shaft, a second spur gear meshingtherewith and loose on the driven shaft, a worm gear loose on the drivenshaft, a worm screw on said worm shaft meshing with said wormgear, aclutch element splined on the driven shaft and adapted for connectingeither the loose spur gear or loose worm gear thereto, and means forshifting said clutch element.

2. A gearing mechanism of the character described adapted for use with areciprocating type machine tool, comprising a driven shaft, a drivingworm shaft, an intermediate shaft having a bevel gear fixed thereon, asecond bevel gear meshing therewith and fixed to the worm shaft, a spurgear fixed on said intermediate shaft, a second spur gear meshingtherewith and loose on the driven shaft, a worm gear loose on the drivenshaft, a worm screw on said worm shaft meshing with said worm gear forrevolving the same in the opposite direction from said loose spur gearand at a slower speed, a clutch element splined on the driven shaft andadapted for connecting either the loose spur gear or loose gear thereto,and means for shifting said clutch element.

3. A gearing mechanism of the character described adapted for use with areciprocating type machine tool, comprising a driven shaft, a drivingworm shaft, an intermediate shaft having a bevel gear fixed thereon, asecond bevel gear meshing therewith and fixed to the worm shaft, a spurgear fixed onsaid intermediate shaft, a second spur gear meshingtherewith and loose on the driven shaft, said spur gear on saidintermediate shaft having a friction (11'1"0 connection therewith, aworm gear loose on the driven shaft, a worm screw on said thereto, andmeans forshifting said clutch element.

In witness of the foregoing I aflix my sigi m nature. 1,

HARRY J. CALDWELL.

CERTIFICATE OF' CORRECTION.

Patent No. 1, 763, 645. GrantedlJune 17, 1930; to

HARRY J. CALDWELL.-

It is hereby certified that error appears in the printer; seecitioetionof the above numbered patent requiring correction as toliows: Page 2,line 116, cisirn v 2, after-the word "loose" insert the word "worm";andtthat the said Letters Patent should be read with this correctiontherein that the shine may conform to the record of the case inflthePatent Office.

Signed and sealed this 22nd day of July, A. D. 1930.

Wm. A. Kinnam g (Seal) t Acting Commissioner of Patents.

